Securing the ends of service-pipes to gas or other mains.



' B. R. PARKINSON. SECURING THE ENDS OF SERVICE PIPES T0 GAS OROTHERMAINS.

APPLICATION FILED OCT. 12, 1908.

Patented Aug. 23, 1910.

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Warm/7, (J) 4%? B. R. PARKINSON. SECURING THE ENDS OF SERVICE PIPES T0GAS OR OTHER MAINS. APPLICATION FILED OCT. 12, 1908. 968,258, PatentedAugv23, 1910;

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UNITED STATES PATENT carton.

BERNARD ROBERT SON, OF LEIGHTON EUZZARD, ENGLAND, ASSIGNOR OF ONE- HALF'10 HENRY WOODALL, OF WESTMINSTER, ENGLAND.

. SECURING THE ENDS 0F SERVICE-PIPES T0 GAS OR OTHER MAINS.

Specification of Letters Patent.

Application filed October 12, 1908. Serial No. 457,404.

To all whom it my concern:

Be it known that I, BERNARD ROBERT PARKINSON, a subject of the King ofGreat- Britain and Ireland, residing at Restholme, Albany Road, LeightonBuzzard, in the county of Bedford, England, have invented new and usefulImprovements Relating to Securing the Ends of Service-Pipes to Gas orother Mains, of which the following is a specification.

The invention is primarily intended vto overcome the difficulty ofmaking an eflicient connection between service pipes and steel mainswhere the metal of the latter is only of sufficient thickness to allowtwo or three tapping threads.

In carrying out the invention the nipple or short length of pipeisprovided internally at its lower end with an annular bead orprojection. A hole is drilled and tapped in the main in the usual wayand the nipple or short length of pipe is screwed in until its lowerend, with the internal bead, projects within the main to the requiredextent. The riveting of the nipple or short length of pipe is effectedby means of a tapered mandrel or, if desired,a punch provided at itsforward end with an enlarged portion, the greatest diameter of which isapproximately equal to the internal diameter of the body of the nippleor short length of pipe. The enlarged portion of the mandrel or thepunch is drawn or driven right through the nipple or short length ofpipe and passing the bead or projection expands same and rivets it'overthe inner surface of the main leavin the nipple or the like of equalbore throng its length. After the nlpple or short length of pipe hasbeen secured firmly to the main a gas or water tight joint is made moresecure by means of any suitable arrangement of saddle, such as thathereinafter described. The nippleis then connected to the service pipein any suitable manner.

In order that my invention may be thoroughly understood I will now referto the accompanying drawings.

Figures 1 and 2 are sections-of expansible nipples which have been foundto give good results in practice. Figs. 3 and 4 are a plan and sectionof a cast iron saddle and Figs. 5 and 6 are corresponding views of aguttapercha ring for use with the saddle. Figs. 7 and 8 are sections,respectively illustrating a nipple of the form shown in Fig. 1 screwedinto a main ready to be expanded, and said nipple expanded, as well asone form of tool by which the riveting or expansion can be effected.Fig. 9 is a section showing the completed joint ready to be connected tothe service pipe.

'In carrying out my invention I make use of an expansible nipple orshort length of pipe A which is provided at the lower end of itsexterior surface with the requisite number of threads a of suitablefineness, say

Patented Aug. 23, 1910.

twenty threads to the inch, and at the upper.

portion of its exterior with a suitablenumber of threads a to enable itto be connected to the gas or water service pipe. The nip-. ple A isfurther provided at the interior surface of its inner end with anannular bead or thickened portion A. The remainder of the interior of,the nipple may be formedwith a bore of the same diameter throughout, asshown in Figs. 1 and 7, or it may be made with a bore of two slightlydifferent diameters arranged as shown in Fig. 2. In the latter case thesides of the smaller diameter, which would only extend upward to a levelwith the top of the screw (1, would be also expanded by the mandreluntil the bore of the nipple was of uniform size throughout.. The main Bis tapped with a thread corresponding to the screwed portion a of thenipple A and after the nipple has been screwed into the main B thebeaded or thickened portion A is expanded or riveted over on to theinner surface of the main by means of any suitable tool.

A tool which I have found to be convenient for the purpose of expandingthe nipple is, shown in Figs. 7 and 8. ThlS tool consists of a screwedmandrel C, a nut D and a sleeve E. The mandrel is providedwith a taperedportion 0 which effects the expansion of the beaded or thickened portionA anda screwed part 0 of considerable length which engages with the nutD. The sleeve E is formed at its lower end with a screwed re: cess e,which engages with the upper screwed part a of the nipple A, andpreferably with a recess 6 adapted to receive a corresponding round partd formed on'the nnt D. The forwardend of the tapered portion 0 of themandrel is preferably provided with a cylindrical extension 0 so astoallow for wear. In using this tool the sleeve is first screwed on to thenipple. The mandrel is then passed into the sleeve and is secured inoperative position therein by threading the nut on to the screwedportion of the mandrel and turning the nut until its lower face bearsagainst the top of the sleeve and the coned portion of the mandrel isdrawn tight up against the beaded or thickened portion of the nipple.The nipple, carrying the tool is then screwed into the tapped hole inthe main and riveting or expansion effected by turning the nut. The toolis then removed from the expanded nipple which can afterward beconnected up to the service pipe. As shown in Fig. 9 I prefer to effectthe connection by means of a socket F engaging with the screw a andbearing against a cast iron saddle G, the lower end 0 which is formedwith a recess G for the reception of a compressible gutta-percha ring H.The'saddle iece is preferably made of square shape in p an, as shown inFig. 3, so that it can be held a ainst movement by a spanner, when thesoc et is being screwed home.

Instead of ex anding the nipple by means of the above escribed tool the.expansion may be effected b other tools, such as a punch or mandrelaving a head of bulbous orm adapted to be drlven downward by means of ahammer. The'punch would be rovided with suitable means for enabling t tobe withdrawn, such as a projection by which it could be knocked out by ahammer,

and its stem would be of sulficient length to prevent the mandreldropping into the main.

If desired the lower end of a nipple of the above described kind couldbe made. of tapered shape and 'be left unscrewed in which case said endwould be forced into a correspondingly shaped hole in the main and thenexpanded as above described.

Having now described my invention, what I have invented and desire tosecure by Letters Patent of the United States of America is as follows Anipple for securing a service pipe to a main formed on the lower part ofits exterior surface with a number of fine threads and on the upperportion of its exterior surface with a number of coarser screw threads,said nipple bein provided at the extremity of its lnner en with aninternal head of such a size as to afford the necessary sub? stance forallowin the inner end of the ni ple to be expande 'on to the surface oft e mam.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

BERNARD ROBERT PARKINSON.

Witnesses:

PERCY PHILLrPrs, CHARLES FLETCHER ENNIS.

